Welding-electrode



UNITED STATES PATENT OFFICE.

CAMPBELL C. CARPENTER, OF NIAGARA FALLS, NEW YORK, ASSIGNOR TOU. S. LIGHT &

HEAT CORPORATION, OF NIAGARA FALLS, NEW YORK, A. CORPORATION OF NEW Patented Dec. 9, 1919.

YORK.

WELDING-ELECTRODE.

1,324,227. Specification of Letters Patent.

I No Drawing.

1 and useful Improvements in Welding-Elecmetallic electrodes in electric welding.

- air and moisture.

trodes, of which the following is a specification. I

The present invention relates to welding electrodes.

Various means have been provrded for 11nproving the quality of the weld formedrby 4 or this purpose the metallic electrode has been coated with a substance which, at the welding temperature, will form a gas or molten liquid. This coating, when gasified or liquefied, has the function of protecting the weld from the surrounding air. One difficulty that has been encountered with such coatings is that the coating is fragile aiithreaclily chips off of the electrode, both during the storage of the electrode and during the use of the electrode. I

An object of the present inventlon 1s to provide an electrode coatmgwhlch W'lll protect the deposited metal during the welding process and which will be firm and free from chipping from the electrode with ordmary usage.

A further object is to provide a method of coating electrodes which will result in an improved product, whereby a coat1ng Wlll be produced which will not ch p off.

In carrying out the present invention, the electrode is first rendered free from oil. For this purpose a soap and caustic solution or any other oil solvent may be used. The electrode is also freed from all traces of rust by mechanical or chemical means.

After the electrode is perfectly clean it may be coated with any of the well known coatings such as the combination of sodium silicate and calcium carbonate. VVh'en this coating is thoroughly dry, it is covered with a layer consisting of a substance impervious to moisture, thus protecting the underlying coating as well as the underlying metal from This coating should also preferably have the property that when. decomposed by heat, non-oxidizmg gases w1ll be formed at the welded surface. thus preventing oxidization of the weld. The super- .Application filed March 19, 1919. Serial No. 283,600i.

posed layer may be nitrated cotton, acetone m xture, such as known in the art as cellu- 101d lacquers or it may be ordinary spirit gum lacquers. i

The resulting electrode will be sturdy and Will withstand ordinary usage. The moisture in the air'will have no effect upon it, so that electrodes may be made up long in advance of the time that they are to be used.

One embodiment of the present invention has been described in detail. Many modifications will occur to those skilled in the art. It is intended that the patent shall cover all such modifications that come within the scope of the invention as defined by the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States,

1. A welding electrode comprising a metallic member, a coating on said member having the function, when liquefied or gasified, of protecting the welded surface from the surrounding air, and a protecting coating for said first mentioned coating consisting of a substance impervious to moisture.

2. A welding electrode comprising a metallic member, acoating on said member having the function, when liquefied or gasified, of protecting the welded surface from the surrounding air, and a protecting coating for said first mentioned coating consisting of a substance impervious to moisture, said second mentioned coating having the property that when decomposed by heat, nonoxidizing gases will be formed.

3. The method of protecting coated welding electrodes which consists in coating with a substance impervious to moisture.

4. The method of protecting coatedwelding electrodes which consists in coating with a substance impervious to moisture which, at welding temperatures, will decompose to form a non-oxidizing gas.

5. A welding electrode comprising a welding member, a coating therefor having the function, when gasified or liquefied, of protecting the welded surface and a coating 6. Awelding electrode comprising a, Weidstances in the air, said, second mentioned ing member, a coating t for 11min the coating having the property of decomposfunction, when gneified nefied, of proing at Welding temperatures to form non- 10 tecting the Welded smmce an a coating oxidizing gas to protect the \\-'elded.surfuee.

5 for said first coating for p: I 3 1n. witness whereof, I have hereunto subfirst coating from ineehnnice} scribed my name.

CAMPBELL C. CARPENTER. 

